气动雾化进样-微波等离子体炬质谱法快速测定水样中的钙离子

摘要

Metal element contents in water samples are commonly determined by Inductively Coupled Plasma-Mass Spectrometry( ICP-MS). ICP-MS has a low detection limit and wide linear range,but has a high power,large gas consumption,and high cost. A rapid method for the determination of calcium ions in water samples was developed by using Microwave Plasma Torch( MPT)-Mass Spectrometry coupled with pneumatic nebulization. The effects of carrier gas flow rate and the support gas flow rate on calcium response signal were investigated. The detection limit of this method is 224. 56 ng/L,relative standard deviations(RSDs)are 1. 2% -9. 8%,and recoveries range from 86. 3% to 110. 4%. This method avoids sample pretreatment,and has a short analysis time,good sensitivity and precision. This method provides a new approach for the determination of metal ions in environmental water and may be used for in situ analysis in the future.%环境水样中金属元素的分析通常采用电感耦合等离子体质谱法（ ICP-MS ），检出限低、线性范围宽，但仍存在使用功率高、耗气量大、分析成本高以及不适用于现场分析等不足。本文为降低金属元素分析成本，建立了微波等离子体炬（ MPT）与有机质谱耦合的方式检测水样中钙离子的新方法。详细探究了载气流速和维持气流速对钙离子响应信号的影响，方法检出限为224.56 ng/L，相对标准偏差（ RSD）为1.2％~9.8％，加标回收率在86.3％~110.4％之间。本方法无需样品预处理，分析速度快、灵敏度和精确度高，为环境水样中金属离子的测定提供了新途径，有望应用于金属离子的实时在线分析。